| Date | From | To | ||
|---|---|---|---|---|
| unknown | Glenmary Home Missioners | Founded | ||
| unknown | Nunciature to Slovakia | Established | ||
| unknown | Titular See of Tharona | Suppressed | ||
| unknown | Secular Institute of Pius X | Founded | ||
| unknown | Apostolic Administration of Mérk, Hungary | Suppressed | ||
| 4 Jan | Diocese of Yokohama, Japan (Gumma, Tochigi, Haralci, and Saitama) | Territory Lost | Prefecture Apostolic of Urawa, Japan | Erected |
| 5 Jan | Archdiocese of Colombo, Sri Lanka (North-Western Province) | Territory Lost | Diocese of Chilaw, Sri Lanka | Erected |
| 5 Jan | Vicariate Apostolic of Northern Burma {Birmania Settentrionale}, Myanmar (Banmaw, Myitkyina, and Katha (except Mogok and valley Hukaumg)) | Territory Lost | Prefecture Apostolic of Bhamo, Myanmar | Erected |
| 5 Jan | Vicariate Apostolic of Northern Burma {Birmania Settentrionale}, Myanmar | Name Changed | Vicariate Apostolic of Mandalay, Myanmar | Name Changed |
| 5 Jan | Vicariate Apostolic of Matadi, Congo (Dem. Rep.) (area south of the urban district of Léopoldville city) | Territory Lost | Vicariate Apostolic of Léopoldville, Congo (Dem. Rep.) | Territory Added |
| 28 Jan | Archdiocese of Gniezno e Poznań, Poland (Sanniki) | Territory Added | ||
| 4 Feb | Archdiocese of Bamberg, Germany (North of Nuremberg)
Diocese of Eichstätt, Germany (South of Nuremberg) | Territory Added | ||
| 15 Mar | Prefecture Apostolic of Buéa, Cameroon | Elevated | Vicariate Apostolic of Buéa, Cameroon | Elevated |
| 15 Mar | Prefecture Apostolic of Malang, Indonesia | Elevated | Vicariate Apostolic of Malang, Indonesia | Elevated |
| 15 Mar | Prefecture Apostolic of Swaziland | Elevated | Vicariate Apostolic of Swaziland | Elevated |
| 15 Mar | Prefecture Apostolic of Tefé, Brazil (Saint Philip) | Territory Lost | Territorial Prelature of Juruá, Acre, Brazil | Territory Added |
| 15 Mar | Vicariate Apostolic of Kirin [Jilin], China (Tung-peh and Lung-chen) | Territory Lost | Prefecture Apostolic of Qiqihar [Tsitsihar], China | Territory Added |
| 15 Mar | Vicariate Apostolic of Miarinarivo, Madagascar (Ankavandra) | Territory Lost | Prefecture Apostolic of Morondava, Madagascar | Territory Added |
| 1 Apr | Diocese of San Carlos de Ancud, Chile (Puerto Montt, Puerto Varas, Puerto Octay, Codiamo, Colegual, Poliœones/ Las Quemas del Santo, Panitao, Piedra Azul, Calhueo, Puluqui, Maullin, Huar, Rolecha, Christo Rey de Puerto Montt, Frutillar, Rio Frió, and San Ignacio de Puerto Montt) | Territory Lost | Diocese of Puerto Montt, Chile | Erected |
| 1 Apr | Archdiocese of Paderborn, Germany (Part of B. Mary Assumption into Heaven in Gelsenkirchen-Rotthausen) | Territory Lost | Archdiocese of Köln {Cologne}, Germany | Territory Added |
| 1 Apr | Diocese of Lublin, Poland (Tilniki and Wladyslawów) | Territory Lost | Diocese of Siedlce, Poland | Territory Added |
| 15 Apr | Diocese of Carpi, Italy (S. Antonio, La Bordinetta, and Ponte Pietra) | Territory Lost | Archdiocese of Modena (e Nonantola), Italy | Territory Added |
| 15 Apr | Archdiocese of Modena (e Nonantola), Italy (C. Pignatti, Vuccelliera, Qualiara, S. Liberated, Montalbano, and Dogale Delfini) | Territory Lost | Diocese of Carpi, Italy | Territory Added |
| 24 Apr | Vicariate Apostolic of Sienhsien [Xianxian] (Siensien), China (Kihsien, Ilengslmi, Tsaokiang, Wujiy Sinlio, Nankung, Fou'cheng, Kucheng, Wukiao, Kinghsien, Tungkwang, and Ningtsing) | Territory Lost | Prefecture Apostolic of Kinghsien [Jingxian], China | Erected |
| 25 Apr | Vicariate Apostolic of Seul, Korea (South) (Kang-uen-to (Kogendo)) | Territory Lost | Prefecture Apostolic of Shunsen, Korea (South) | Erected |
| 25 Apr | Vicariate Apostolic of Dakar, Senegal (Ziguinchor, Bignona, Sedhiou, Kolda, Upper Gambia, and part of Tambacounda) | Territory Lost | Prefecture Apostolic of Ziguinchor, Senegal | Erected |
| 25 Apr | Prefecture Apostolic of Ipamu, Congo (Dem. Rep.) (Boundaries Adjusted)
Vicariate Apostolic of Koango o Kwango, Congo (Dem. Rep.) (Boundaries Adjusted) | Territory Added | ||
| 13 May | Diocese of Ceneda, Italy | Name Changed | Diocese of Vittorio Veneto, Italy | Name Changed |
| 13 May | Archdiocese of Goiás, Brazil (Our Lady of Conception de Barra, Our Lady of Pilar de Ouro Fino, San José de Massamedes, and S. Rita)
Diocese of Porto Nacional, Tocatins, Brazil (Territory next to the river Araguaya) Territorial Prelature of São José de Alto Tocantins, Brazil (Crixas (with Chapel of S. Joseph de Araguaya)) | Territory Lost | Territorial Prelature of Bananal, Brazil | Territory Added |
| 13 May | Diocese of Bathurst in Canada, New Brunswick (Rogersville and Harwicke) | Territory Lost | Archdiocese of Moncton, New Brunswick, Canada | Territory Added |
| 16 May | Congregation of Christian Workers of Saint Joseph Calasanz | Approbation | ||
| 20 May | Diocese of Concepción, Chile | Elevated | Archdiocese of Concepción (Santissima Concezione), Chile | Elevated |
| 20 May | Diocese of La Serena, Chile | Elevated | Archdiocese of La Serena, Chile | Elevated |
| 20 May | Diocese of Chillán, Chile (from Santiago de Chile) | Metropolitan Changed | ||
| 20 May | Diocese of Temuco, Chile (from Santiago de Chile) | Metropolitan Changed | ||
| 20 May | Diocese of San Carlos de Ancud, Chile (from Santiago de Chile) | Metropolitan Changed | ||
| 20 May | Diocese of Iquique, Chile (from Santiago de Chile) | Metropolitan Changed | ||
| 20 May | Diocese of Antofagasta, Chile (from Santiago de Chile) | Metropolitan Changed | ||
| 25 May | Vicariate Apostolic of Uganda | Territory Lost | Vicariate Apostolic of Masaka, Uganda | Erected |
| 25 May | Vicariate Apostolic of Majunga, Madagascar (Kiangara)
Mission "Sui Iuris" of Miarinarivo, Madagascar Vicariate Apostolic of Tananarive, Madagascar (Ankazobe and part of Arivonimamo) | Elevated | Vicariate Apostolic of Miarinarivo, Madagascar | Elevated |
| 25 May | Vicariate Apostolic of Diégo-Suarez, Madagascar (Part of Tamatave)
Vicariate Apostolic of Tananarive, Madagascar (Brickaville and part of Tamatave) Prefecture Apostolic of Vatomandry, Madagascar | Elevated | Vicariate Apostolic of Tamatave, Madagascar | Elevated |
| 3 Jun | Archdiocese of Santa Fe, Argentina (Chaco and Formosa) | Territory Lost | Diocese of Resistencia, Argentina | Erected |
| 3 Jun | Diocese of Cagayan de Oro, Philippines (Provinces of Surigao and Agusan) | Territory Lost | Diocese of Surigao, Philippines | Erected |
| 13 Jun | Vicariate Apostolic of Cape of Good Hope, Western District {Capo di Buona Speranza, Distretto Occidentale}, South Africa | Name Changed | Vicariate Apostolic of Cape Town, South Africa | Name Changed |
| 13 Jun | Prefecture Apostolic of Cape of Good Hope, Central District {Capo di Buona Speranza, Distretto Centrale}, South Africa | Name Changed | Prefecture Apostolic of Oudtshoorn, South Africa | Name Changed |
| 13 Jun | Prefecture Apostolic of Benkoelen, Indonesia | Elevated | Vicariate Apostolic of Palembang, Indonesia | Elevated |
| 13 Jun | Prefecture Apostolic of Northern Transvaal {Transvaal Settentrionale}, South Africa | Elevated | Territorial Abbey of Pietersburg, South Africa | Elevated |
| 13 Jun | Vicariate Apostolic of Cape of Good Hope, Eastern District {Capo de Buona Speranza, Distretto Orientale}, South Africa | Name Changed | Vicariate Apostolic of Port Elizabeth, South Africa | Name Changed |
| 22 Jun | Vicariate Apostolic of Cirenaica, Libya (Derna) | Territory Lost | Vicariate Apostolic of Derna, Libya | Erected |
| 22 Jun | Vicariate Apostolic of Cirenaica, Libya | Name Changed | Vicariate Apostolic of Benghazi, Libya | Name Changed |
| 22 Jun | Vicariate Apostolic of Tripolitana, Libya (Misurata) | Territory Lost | Prefecture Apostolic of Misurata, Libya | Erected |
| 22 Jun | Vicariate Apostolic of Tripolitana, Libya | Name Changed | Vicariate Apostolic of Tripoli, Libya | Name Changed |
| 3 Jul | Apostolic Exarchate of Miskolc (Hungarian), Hungary (Rudabanyacslca and Beregdaroc) | Territory Lost | Eparchy of Mukachevo (Munkács) (Ruthenian), Ukraine | Territory Added |
| 3 Jul | Eparchy of Mukachevo (Munkács) (Ruthenian), Ukraine (Bodrogmezo, Bodrogszerdahely, Kisdobra, and Zemplen) | Territory Lost | Diocese of Hajdúdorog (Hungarian), Hungary | Territory Added |
| 11 Jul | Vicariate Apostolic of Upper Congo {Congo Superiore}, Congo (Dem. Rep.) | Name Changed | Vicariate Apostolic of Baudouinville, Congo (Dem. Rep.) | Name Changed |
| 11 Jul | Prefecture Apostolic of Mount Currie, South Africa | Elevated | Vicariate Apostolic of Kokstad, South Africa | Elevated |
| 11 Jul | Prefecture Apostolic of Lang Són et Cao Bang, Viet Nam | Elevated | Vicariate Apostolic of Lang Són et Cao Bang, Viet Nam | Elevated |
| 11 Jul | Prefecture Apostolic of Peng-yang, Korea (North) | Elevated | Vicariate Apostolic of Heijo, Korea (North) | Elevated |
| 11 Jul | Prefecture Apostolic of Yangku [Yanggu], China | Elevated | Vicariate Apostolic of Yangku [Yanggu], China | Elevated |
| 11 Jul | Vicariate Apostolic of Foumban, Cameroon (Bafia) | Territory Lost | Vicariate Apostolic of Yaoundé, Cameroon | Territory Added |
| 11 Jul | Diocese of Osaka, Japan (Nara and Mie) | Territory Lost | Prefecture Apostolic of Kyoto, Japan | Territory Added |
| 15 Jul | Archdiocese of Milano {Milan}, Italy (Paltanedo, Campore, Gottardo, and Toppi) | Territory Lost | Diocese of Como, Italy | Territory Added |
| 15 Jul | Diocese of Como, Italy (Valley of Cucciago from Molinetto to Bernardelli) | Territory Lost | Archdiocese of Milano {Milan}, Italy | Territory Added |
| 19 Jul | Diocese of Oradea Mare {Gran Varadino, Nagyvárad} and Satu Mare {Szatmár}, Romania (Territory in Hungary) | Territory Lost | Apostolic Administration of Satu Mare {Szatmár} in Slovakia, Slovakia | Erected |
| 20 Jul | Diocese of Massa Carrara, Italy | Name Changed | Diocese of Apuania, Italy | Name Changed |
| 20 Jul | Prefecture Apostolic of Multan, Pakistan | Elevated | Diocese of Multan, Pakistan | Elevated |
| 20 Jul | Prefecture Apostolic of Wuchow [Wuzhou], China | Elevated | Vicariate Apostolic of Wuchow [Wuzhou], China | Elevated |
| 22 Jul | Archdiocese of Baltimore, Maryland, USA | Name Changed | Archdiocese of Baltimore-Washington, Maryland, USA | Name Changed |
| 22 Jul | Archdiocese of São Luís do Maranhão, Brazil (Caxias, Mattöes, San Francisco, Passagem Franca, Picos, Pastos Bons, Mirador, Loreto, Riachão, Victoria do Alto Parnahïha, Flores, Burity Bravo, Bardo de Grajahù, Patos, New York, Balsas, and Benedicto Leite) | Territory Lost | Diocese of Caxias do Maranhão, Brazil | Erected |
| 22 Jul | Territorial Prelature of São José do Grajaú, Brazil (Turiaçu and Carutapera)
Archdiocese of São Luís do Maranhão, Brazil (Pinheiro, Alcântara, Cururupu, Guimarães, Bequimão, and Santa Helena) | Territory Lost | Territorial Prelature of Pinheiro, Maranhão, Brazil | Erected |
| 17 Sep | Apostolic Exarchate of Belarus (Byzantine) | Erected | ||
| 17 Sep | Apostolic Exarchate of Great Ukraine (Byzantine) | Erected | ||
| 17 Sep | Apostolic Exarchate of Volyn, Polesia and Podlasie (Byzantine), Ukraine | Erected | ||
| 5 Oct | Vicariate Apostolic of Alep [Beroea, Halab], Syria (Hatay (Sangiaccato di Alessandretta)) | Territory Lost | Vicariate Apostolic of Constantinople, Turkey | Territory Added |
| 29 Oct | Misioneros Javerianos de Yarumal | Approbation | ||
| 10 Nov | Nunciature to Uruguay | Restored | ||
| 11 Nov | Archdiocese of Durrës (Durazzo), Albania (Elbassan, Korea, Berat, Wallona, and Argyrocastro) | Territory Lost | Apostolic Administration of Southern Albania {Albania Meridionale} | Erected |
| 14 Nov | Prefecture Apostolic of Luapula Superiore, Congo (Dem. Rep.) | Elevated | Vicariate Apostolic of Sakania, Congo (Dem. Rep.) | Elevated |
| 25 Nov | Diocese of Natal, Brazil (Gurraes Novos, Acary, Jardin do Seridò, Parelhas, Serra Negra/Flores, and part of Caicó) | Territory Lost | Diocese of Caicó, Rio Grande do Norte, Brazil | Erected |
| 7 Dec | Vicariate Apostolic of Wuchang [Wuchang], China (Middle and right bank of the Yangtse Kiang river) | Territory Lost | Vicariate Apostolic of Kichow [Qichun], China | Territory Added |
| 9 Dec | Vicariate Apostolic of Alep [Beroea, Halab], Syria (Cilicia (Adana, Mersina, and Tarsus)) | Territory Lost | Vicariate Apostolic of Constantinople, Turkey | Territory Added |
| 12 Dec | Missionaries of the Holy Spirit | Approbation | ||
| 16 Dec | Archdiocese of Santa Fe, New Mexico, USA (San Juan, McKinley, and Catron counties and parts of Rio Arriba, Sandoval, Bernalillo, and Valencia)
Diocese of Tucson, Arizona, USA (Mohave, Coronino, Yavapai, Navajo, and Apache) | Territory Lost | Diocese of Gallup, New Mexico, USA | Erected |
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